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{{Infoboxemulator|image logo = Cemu-Logo.png|first version = {{CemuVer}}|second active = Yes|third platform = Windows|fourth architecture = x86_64|target = [[Wii U emulators|Wii U]]|developer = Exzap, Petergov|fifth website = [http://cemu.info Cemu]|sixth license = Closed -sourcefreeware|support = [https://www.patreon.com/cemu Patreon]}}'''[[wikipedia:Cemu|Cemu]]''' is a closed-source, Windows-only [[Wii U emulators|Wii U emulator]]. Currently, the GamePad, Classic, and Pro controllers are emulatedfor Windows. It also requires a high-end PC is known to run games at full speed, although there are numerous bugs be the very first Wii U emulator ever that can crash boot games due to unimplemented features. The latest version of Cemu is restricted at first to project donors before being A compatibility list can be found [http://compat.cemu.info/ here] or [http://docs.google.com/spreadsheets/d/19WV2YQvS2PkiHnQTlYP7cE2eHOPl06Rx4tCvfud_Hpw/edit?pref=2&pli=1#gid=0 here]. Before updates are publicly released , they're accessible to the public.<ref>backers over at [https://www.patreon.com/cemu</ref>their Patreon].

* [http://cemu.info/index.html#download Latest free public release]

You will also need enough storage for the [[Wii U emulators|Wii U]] games. Running Cemu on [[Wine]] has been reported to work just as well as Windows.===Minimum===* OS: Windows 7 (64-bit) or above* GPUGraphics Card: Supports at least OpenGL 4.0 or above, Intel iGPUs are not recommended1* RAMMemory: 4 GB minimum, ===Recommended===* Windows 10 (64-bit)* Graphics Card: Supports OpenGL 4.6 (avoid integrated graphics)* Memory: 8 GB or more recommended ==Game Formats and Files Needed=====Physical Dumps===You'll first need to fill in the "keys.txt" file in Cemu's directory. It has a sample line with a bogus key and a comment, which you may as well delete.  Your file must have many lines like this, one for the Wii U Common Key (D7B00402659BA2ABD2CB0DB27FA2B656), and one line for the Game Key of each game. Sharing these keys isn't exactly safe legally, but ROM sites at least share [http://pastebin.com/GWApZVLa the Game ones]. Note that for games using the Loadiine format, you won't need a Game Key at all, but those will need Cemu versions from 1.4.0 onward. Your ISO must be either uncompressed, compressed using WUD format, or in Loadiine format (only possible for versions 1.4.0 onward) to boot in Cemu. Here's a [http://docs.google.com/spreadsheets/d/19WV2YQvS2PkiHnQTlYP7cE2eHOPl06Rx4tCvfud_Hpw/edit?pref=2&pli=1#gid=0 compatibility list]. Dump your discs using [https://gbatemp.net/threads/wudump-dump-raw-images-from-a-wiiu-game-disc.451736/ Wudump]. ===Digital Copies===Cemu supports either physical games dumps in WUD, or compressed WUX format, as well as game dumps converted to the Loadiine format. Loadiine games come as multiple directories with game files and a .rpx file. Nintendo's servers are poorly secured due to a huge oversight when designing Wii U/3DS software protection. As such, with tickets proving you bought the game (but which you can get through less legit ways), there are downloader utilities like NUSGrabber, FunKiiU, UWizard, or jnus among others, and decryption tools like UWizard and CDecrypt, to obtain a functional copy. The process of how to exactly acquire those files is detailed elsewhere on this wiki. Load the .rpx file from [Your gamelocation]/code/[yourgame].rpx with Cemu.

==How to get games=Updates and DLC===*Download an NUS downloader such as [http://application.wiiuusbhelper.com/Updater.exe WiiU USB Helper]Prior to 1.*Paste this URL into WiiU USB helper when prompted for the titlekey database7. - https://wiiu.titlekeys.com/Select the game you want to download3, click get it and then download games.*This will download the only updates were supported though pasting update files for on the main game you chose (the same as the .tik's title). May I suggest that you choose your own region where possible, so the download is quicker folders (from your regional servers).*Now we need to convert keeping in mind the main game into loadiine is in Loadiine format so that you can load it in Cemu) and overwriting any files.*Simply right click your newly downloaded gameDLC wouldn't work at all through this method, then click Unpack/Convert to Loadiine (Pack/Unpack - Loadiine/CIA)though with some specific games there were workarounds and some could play DLC tracks in Mario Kart 8 through swapping of specific files.*Load the From 1.rpx file from [Your gamelocation]/code/[yourgame]7.rpx with cemu3 onwards, proper support for DLC and updates was included in Cemu.

To install updates and DLC on Cemu (1.7.3+): * Run the game at least once.* Check Cemu's log.txt file and look for a line that says "Mounting local storage (AOC): .\mlc01\usr\title\NUMBERS\NUMBERS\aoc\"* Add (create) folders with the same name as the above (substituting the "NUMBERS" bit with the actual numbers) in your "CemuFOLDER/mlc01/usr/title" folder.* Add any updates (which must be added first) you want to the "CemuFOLDER/mlc01/usr/title/NUMBERS/NUMBERS/" folder.* Create a folder named "aoc" and put the DLC files into there. The "code", "content", and "meta" folders of the actual game itself also go in the "aoc" folder. ===Amiibo Support===[[Amiibo]] are hard-to-find figurines unlocking various on-disc content in select 3DS and Wii U games. They use the NFC technology. Nintendo Amiibo data is not currently supported via this method, distributed online as NFC tags (.bin files). There's a regularly updated complete set of the official ones but there are specific games that can use DLCalso unofficial spoofed packs on various other sites. Recent versions of Cemu include Amiibo support. Simply go to NFC / Scan NFC Tag from file, with workaroundsand load the relevant .bin file. Keep in mind Amiibo support in Cemu is incomplete right now and not all figurines are compatible yet - though incompatibilities may be caused by bad Amiibo dumps as well. ==Setting Up Cemu=====Controls===Cemu added native support for Wii Remote controllers as of 1.12.0.

To add DLC Cemu cannot connect to games:*Run the game as normal. *Check Cemu's log.txt file and look for a line that says "Mounting local storage (AOC): .\mlc01\usr\title\NUMBERS\NUMBERS\aoc\"*Add (create) folders with the same name as the above real (substituting the "NUMBERS" bit with the actual numbersor emulated) in your cemu\mlc01\etc[[Nintendo 3DS emulators|3DS]]. file*Add any updates (must be added first) and DLC you want to this folder (code, content and meta folders live inside the aoc folder)

==Shadercaches=Cemuhook===Normally, when playing a game in Cemu, a shader cache will be generated as you play. This will cause a lot of stutter and slow the game down the first time you play that level/area/game.Luckily, Cemu allows you to transfer your shader cache, allowing you to download one from a friend (or just someone else on the internet).Reddit seems to be a good place to get these shadercaches. Simply [https://www.reddit.com/r/CEMUcaches/ go here] and search for the game you want a cache for.*Note that it Using this is very difficult to generate a 100% complete shadercache for large games and therefore this will not definitely completely eliminate stutteringoptional.

Transferable shader caches may cause slowdowns in some gamesDownload [http://sshnuke.net/cemuhook/ the latest version] compatible with your Cemu version, unpack it to the same directory as cemu.exe and right-click on some graphics cards (observed in Geforce 970s)dbghelp.dll, check Proprieties, Digital Signatures tab, select a signature and press Details. If this is This should make it no longer crash at start-up. Make sure you also have the caselatest GPU driver installed, delete both your transferable and precompiled caches as well as both x86 and x64 versions of the [https://aka.bin and ms/vs/15/release/toc file in your NVIDIA GLCache found in C:\Users\(You)\AppData\Roaming\NVIDIA\GLCache\(hexstring)\(hexstring)vc_redist. In this case, you will have to generate your own shadersx64.*This may get fixed after 1exe Microsoft Visual C++ 2017 X64 Redistributable].7.0, who knows?

Changing your NVidia Whenever you boot Cemu now, this cemuhook tool is enabled by default and offers various additions for better motion control panel settings emulation or some graphical hacks that greatly enhance Zelda BOTW in particular. Accept to look like this might help with shadercache slowdown issues:download the missing shared fonts as well as to make the text in some games (Super Mario Maker among others) display correctly.

[[File:ShadercachestuffEnabling "GX2SetGPUFenceSkip (HACK)" enhances graphical emulation in BOTW in particular. A pre-installed Graphical Pack that comes with recent versions of Cemuhook, "LWZX Crash Workaround", as well as the "GX2DrawDone()" option under Experimental, should help with some general crashes specific to BOTW.png]]

==Getting more performance=Shader Caches===Some users have reported When your game is loaded, check for its ID on the title bar in front of "SaveDir:" and note it down. The directory where transferable shader caches are stored is <code>.\Cemu\shaderCache\transferable</code>. They're generated the first time you play through a game and at that time cause noticeable stuttering. You can download a complete cache from places like [http://www.reddit.com/r/Cemucaches/comments/7bv7el/complete_shader_cache_collection_1110c_v2/ here] and rename them to match your game version's ID to spare yourself most of that disabling hyperthreading improves performance unpleasant experience. Just keep in mind that shader caches from versions older than 1.8.0 are incompatible with later versions of Cemu. On Windows with hyperthreaded cores At startup, Cemu will prepare a compiled version of that cache under <code>.\Cemu\shaderCache\precompiled</code> and that one depends on your GPU driver, turn off processor affinity so you might want to erase it if any problems or crashes when compiling shaders at startup occur. ==Troubleshooting/Speeding up=====Shadercaches===Shaders are normally cached as you play the game. This can cause a lot of stutters and slow the game down. Cemu accepts other shader caches that can be traded online. You can go to [https://www.reddit.com/r/Cemucaches/ /r/Cemucaches] and search for imaginary coresthe ones you want. This It's often very difficult to generate a complete cache for large games, and will be every other core not completely eliminate stuttering. [[File:Shadercachestuff.png|thumb|Some settings in your processor affinitythe Nvidia control panel might help.]] Some games' transferable caches may cause slowdowns on some graphics cards like the GeForce GTX 970. To do If thisis the case, go you will have to generate your own shaders and delete the ones you downloaded. In the case of the GeForce, also consider deleting the cemu.exe process bin and /toc file in task manageryour GLCache at <code>%APPDATA%\NVIDIA\GLCache\(hexstring)\(hexstring)</code>. ===Native H.264 Decoder===MP4 videos are often encoded for Wii U games with the expectation that the hardware plays it back on-the-fly, but because the x86 architecture is not PowerPC, this is resource-intensive for Cemu since it has to run the PowerPC video decoder. An unofficial utility called [https://sshnuke.net/cemuhook/ Cemuhook] bypasses this by playing H.264 video directly from Windows codecs that are programmed for x86. ===Disable Hyperthreading===Cemu may not be programmed well with hyperthreading. To disable it, go into the Task Manager, right -click, set affinity cemu.exe and then turn off every other coreset these affinities:

==ReferencesGraphics Packs=={{reflist}}To work around emulation bugs and other problems the way [[Dolphin]] does, "Graphic Packs" are title-specific property sheets which define advanced settings you might not be able to change in the interface. Basic rendering options including shadow resolution and quality, post-processing effects like bloom, lighting and god rays, custom anti-aliasing, and such can be applied here. You can even use them to ''reduce'' the internal resolution for an increase in the framerate. This is not to be confused with '''Texture Packs''', which are replacement textures; Cemu doesn't support that, but it is planned. The "Graphic Packs" themselves are folders under the <code>graphicPacks</code> directory. They can be named anything, but they should contain the "<code>rules.txt</code>" file. A bare-bones example of a "Graphics Pack", called "Bayo_1080p", would look like this:  [Definition] titleIds = 0005000010172600,0005000010172700,000500001011b900,000500001014db00,0005000010157e00,0005000010157f00 name = "Bayonetta 1 + 2 - 1080p" [TextureRedefine] width = 1280 height = 720 overwriteWidth = 1920 overwriteHeight = 1080 Whenever the titleId matches the current one, Cemu will show the Graphics Pack under Options -> Graphics Pack. If you don't know what the titleId of the game you want is, check the <code>logs.txt</code> file. You can safely delete it in the event that it gets too big for a text editor to parse. The overwriteWidth and overwriteHeight properties used in this example will upscale the game from 720p to 1080p. But if the game doesn't have all of its textures in the specified resolution, they won't be upscaled and could look messy as a result. In this case, this problem is seen in some FMVs in the game. This is the purpose of the TextureRedefine rule. See some of the community graphics packs at [http://slashiee.github.io/cemu_graphic_packs/ this page]. ==Issues==* Save states aren't getting implemented any time soon. This has a lot to do with the complexity of the Wii U memory layout and architecture, as well as the huge file size. As a result, the current developers are not interested in implementing them.* The emulator is still unfinished and unoptimized, as noted in the lack of efficient and stable H.264 video decoding, causing glitchy videos. This is worked around with Cemuhook entirely, but its approach to video decoding is unlikely to be taken into the emulator. ===Piracy===There are anti-piracy measures on the Patreon early-access builds that are put behind the $5 tier. Backers putting out these builds can get banned if they're caught, and when the program fails verification, it locks down some features that impact performance. Until 1.7.5 was released, mudlord put out cracked versions of early builds on his personal blog. A subreddit and Discord server was made to discuss Cemu piracy. The official subreddit for Cemu advises against downloading unofficial "builds", saying they could potentially be traced with malware, and have made it one of their rules not to advocate it. The Cemu piracy subreddit has encountered malware authors taking advantage of this.